Overview: Alistair Appleton heads to Northumberland to revisit his buyers with a £475,000 budget who have moved into one of the houses he showed them. He discovers how their characterful home has allowed them to kick-start their holiday lettings business ambitions. As well as getting the inside track on the thriving tourist trade around Hadrian's Wall, Alistair and his escapees head to the Roman fort of Vindolanda, where excavations have revealed exciting archaeological discoveries.